JPH0914139A - Enclosed type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure of a device so as to improve work productivity and to economize manufacturing cost, and fix a discharge valve and a valve spring firmly so as to improve the efficiency of a compressor. SOLUTION: A closed type compressor is composed of a discharge valve 34 installed on the inside of a housing part 32 formed at a head 31, a valve spring 35 for elastically supporting the discharge valve 34 in the closing direction, and a retainer 36 for controlling the moving range of the discharge valve 34 and valve spring 35. The valve spring 35 and the retainer 36 are integrally formed, or the valve spring 35 and a valve fixture 39 are integrally formed and installed between the head 31 and a head cover 38.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a hermetic compressor. Specifically, the valve spring that elastically supports the discharge valve that discharges the compressed gas in the closing direction and the retainer that restricts the movement range of the valve spring are integrally formed to simplify the structure of the device and fix the discharge valve. The present invention relates to a hermetic compressor that includes a valve fixing member that improves the closing characteristic of a discharge valve.

[0002]

2. Description of the Related Art Generally, a hermetic compressor used in a cooling system such as a refrigerator has undergone many technical developments for improving efficiency. The mainstream is the lubrication of each mechanism and the improvement of technology for the exhaust system in the cylinder. Among them, the exhaust system has a structure that has a great influence on the improvement of the efficiency of the compressor. Therefore, many technical advances have been made and a number of patents have been presented.

A conventional discharge system in a compressor is composed of a suction valve, a head, a packing and a discharge valve. Such a component has a structure in which the discharge valve is inserted into a seat formed in the head. There are two types of structures that are sequentially coupled to the upper surface of the head. this house,
The form mainly used is a form in which the discharge valve is inserted into the concave groove portion of the head, and such a conventional discharge valve system will be briefly described with reference to the following U.S. Pat.

First, a discharge valve system according to US Pat. No. 4,723,896 will be described. As shown in FIG. 7, a head 2 is provided with a seat 2 for seating the discharge valve system. Has a discharge port 3 formed therein, and a discharge valve 4 is installed so as to cover the discharge port 3. The discharge valve 4 is located above the discharge valve 4 so as to be positioned in the cover-covered state again with the discharge valve opened. The valve spring 5 is installed so as to be elastically supported in the closing direction of the discharge valve 4, and a retainer 6 for restricting the valve spring 5 so that it does not come off above a certain position is provided with a seat 2 of the head 1. It is fixed inside.

A clamp 7 is fixed to the upper side of the retainer 6 in order to fix the many constituent elements. Such a component is coupled between the head cover 8 and the cylinder 9, and a packing 10 is airtightly installed between the head cover 8 and the head 1 in order to prevent the high-temperature and high-pressure refrigerant from flowing out. ing. Here, the unexplained reference numeral 9a indicates a piston.

Also, US Pat. No. 5,209,260 discloses a first mounting portion 12 formed on a head 11, as shown in FIG.
The first receiving portion 12 is formed such that the receiving portion 12a and the second receiving portion 12b form a step, and the seating portion 12 has a relatively deep depth.
A discharge valve 14 and a valve spring 15 are installed at a, and the second receiving portion 12b is shallower than the first receiving portion 12a.
A retainer 16 is fixedly installed in the. Since the retainer 16 embedded in the second receiving portion 12 is firmly fixed to the head 11 in such a discharge valve system,
The clamp in US Pat. No. 4,723,896 is eliminated. Here, unexplained reference numeral 13 is a discharge port, 1
Reference numeral 8 indicates a head cover.

On the other hand, in US Pat. No. 5,328,338, as shown in FIG. 9, the retainer in US Pat. No. 5,209,260 is eliminated and only the discharge valve 24 and the valve spring 25 are provided in the seat portion 22 formed on the head 21. With the installed configuration, the protrusion 28a is formed on the head cover 28 to fix the valve spring 25. Here, the unexplained reference numeral 23 is a discharge port, and 30 is a packing.

The operation of the compressor according to the prior art is the same as that of a normal compressor. When power is applied, the rotor is rotated by the electromagnetic action of the stator and the rotor, The crankshaft is rotated by the rotation of the rotor, the vertical rotational force of the crankshaft is converted into horizontal motion by the connecting rod or slider, the piston is horizontally moved, and the piston reciprocates inside the cylinder. Refrigerant flows into the cylinder through the suction port of the head and the suction valve,
The inflowing refrigerant is compressed by the forward movement of the piston,
It is discharged while passing through the discharge port of the head and opening the discharge valve.

In the valve device according to the prior art constructed and operated as described above, the seat is formed on the head, and the discharge valve is inserted into the seat. This is because when the compressed high temperature and high pressure refrigerant is discharged through the discharge port of the head, the thickness of the head determines the length of the discharge port and the space corresponding to the diameter and length of the discharge port is exposed to the cylinder. Therefore, a part of the compressed refrigerant stays in such a space, so-called dead volume, after the discharge valve is closed, and the suction valve is opened as the piston retracts in the cylinder. There is a problem that the normal flow of the refrigerant is hindered by the re-expansion of the compressed refrigerant that remained in the dead volume when the refrigerant is taken in.To eliminate such problems, shorten the length of the discharge port. Therefore, reducing the thickness of the head is a key point of the technique for increasing the efficiency of the compressor.

[0010]

However, among the above-mentioned prior arts, US Pat. No. 4,723,896 discloses a discharge valve system, a discharge valve 4, a valve spring 5 and a retainer 6 for fixing the same. Since it has a plurality of components, it is difficult to work, and there is a structurally complicated problem such that another fixing groove for inserting the clamp 7 should be formed in the head.

In the above-mentioned US Pat. No. 5,209,260,
Although the clamp 7 is eliminated, not only can the structure of the retainer 16 not solve the structural complexity, but the retainer 16 is fixed to the head 11, so that the central portion of the retainer 16 has a rear surface shape and the valve spring 15 is Since it stops at a position outside the fixed position, the opening / closing timing of the discharge valve 14 is not properly adjusted, and the compressed refrigerant flows backward or the re-expansion loss increases, which causes a problem of reducing the efficiency of the compressor.

Further, in the US Pat. No. 5,328,338, since the valve spring 25 is fixed by using the tongue-like packing 30 while forming the protrusion 28a on the head cover 28, it is difficult to manufacture parts, and the valve spring There are defects that are not effectively fixed.

On the other hand, although not shown in the drawings, in the valve device disclosed in US Pat. No. 5,178,183, the components are simplified to a discharge valve and a valve spring so that the valve spring also serves as a retainer. However, there is a problem that the valve spring is not enough to fix the discharge valve.

Therefore, it is an object of the present invention to integrally form a valve spring and a retainer on a single flat plate to structurally simplify the device. Another object of the present invention is to improve the performance of the compressor by forming another discharge valve fixing member and firmly fixing the discharge valve to accurately control the opening and closing timing and range of the discharge valve.

[0015]

In order to achieve the above object of the present invention, a discharge valve for opening and closing a discharge port provided in a concave groove formed in a head and a valve spring for elastically supporting the discharge valve. A retainer for restricting the movement range of the discharge valve and the valve spring, and a valve fixing tool for fixing the discharge valve with a fixing portion,
A hermetic compressor is provided in which the valve spring and the valve fixture are integrally formed and installed between a head and a cover of the head. The integrally formed valve spring and valve fixing member are attached to the plate body. The valve spring and the valve fixing member integrally formed are inserted and fixed to a fixing protrusion formed on the head.

Further, a discharge valve installed in a groove formed in the head to open and close a discharge port, a valve spring elastically supporting the discharge valve, and a retainer for restricting a moving range of the discharge valve and the valve spring. And a valve spring and a retainer that are integrally formed and installed between a head and a head cover. The integrally formed valve spring and the retainer are attached to the plate body. A valve fixture may be installed on the opposite side of the integrally formed valve spring and the retainer.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention as described above will be described in detail with reference to the accompanying drawings. In the valve device of the hermetic compressor according to the embodiment of the present invention, as shown in FIGS. 1 and 2, a seat 31 is formed on a head 31 having a discharge port 33, and the seat 32 is formed. A discharge valve 34 that opens and closes the discharge port 33 is installed inside 32, and a valve spring 35 that elastically supports the discharge valve 34 in a closing direction is provided, and a retainer 36 that fixes the discharge valve 34 and the valve spring 35. Are integrally formed with the valve spring 35.

On the upper side of the head 31, a head cover 38 covers the plurality of constituent elements and is connected to the head 31. The valve spring 35 and the retainer 36 are formed on a single plate 40, and the valve spring 35 and the retainer 36 are installed by installing the plate 40 on the seat 32. In addition, the plate 40
Further, a valve fixing member 39 for fixedly supporting one end of the discharge valve 34 is separately formed to firmly fix the discharge valve 34, thereby improving the closing characteristic of the discharge valve 34.

The operation of the valve device according to the present invention constructed as described above is such that when the piston retracts in the cylinder, the suction valve is opened through the suction port of the head, and the refrigerant is sucked into the compression space of the cylinder. After the refrigerant is compressed by the piston that reciprocates by the rotational force of the shaft, the piston moves forward again to move the head 3
It is discharged through the discharge port 33 of No. 1 while opening the discharge valve 34. At this time, the discharge valve 34 is attached to the valve fixture 39.
Thus, the one side portion is opened while being fixed, and the discharge port 33 is closed again by the elastic force of the valve spring 35.

Here, the retainer 36 formed integrally with the valve spring 35 simultaneously fulfills its role by the valve spring 35. The compressed refrigerant that has passed through the discharge valve 34 is discharged by the discharge force to the outside of the compressor through the discharge frame and the discharge pipe.

On the other hand, in the modification of the embodiment of the present invention, as shown in FIGS. 3 and 4, a structure in which the valve fixing member 39 'is integrally formed with the valve spring 35' is also possible.
Such a structure has an effect of further simplifying the structure of the plate body 40 'and reducing the manufacturing cost.

Further, as shown in FIGS. 5 and 6, in order to facilitate fixing of the plates 40, 40 'of the present invention, a modification in which a fixing projection 50 surrounding the discharge valve 34 is formed on the upper surface of the cylinder head 31. Examples can also be implemented. Fixing grooves 50a and 50b into which the plate 40 ″ is inserted and fixed are formed on the inner surfaces of the fixing protrusion 50 that face each other.

As described above, the plate 40 "is inserted and installed in the fixing grooves 50a and 50b of the fixing protrusion 50.
A discharge hole 40a ″ for discharging the high pressure gas discharged through the discharge port 33 is formed on one side of the upper surface thereof.
The discharge valve 34 is provided on one side of the lower surface of the plate 40 ″.
Is provided with a valve fixing member 39 ″, and a valve spring 35 ″ for restricting the opening / closing timing and range of the discharge valve 34 is installed on the other side.

The valve spring 35 "is a plate 40".
From the fixed end 35 ″ b side fixed to the lower surface of the free end 3
It is formed obliquely at a predetermined angle on the 5 "a side, and an end flat portion 35" c is formed at the end on the free end portion 35 "a side so as to maintain a predetermined distance from the discharge valve 34. Has been done.

In the modified example of the discharge valve device of the hermetic compressor according to the present invention having the above-mentioned structure, the cylinder head 31 is installed on one side of the cylinder (not shown) in a suction valve plate (see FIG. (Not shown), the discharge valve 34 is seated inside the fixed protrusion 50, and the discharge port 3 is attached.
3, the fixing grooves 50a, 50 of the fixing protrusion 50 are covered.
The plate body 40 ″ is inserted into b and assembled. Then, the packing is interposed between the cylinder head 31 and the head cover and fastened with screws to assemble.

In the discharge valve device thus assembled, the high-pressure gas compressed in the cylinder by the compression process is discharged while pushing up the discharge valve 34, and the discharge valve 34 is continuously opened as the compression stroke continues. Then, when the valve spring 35 ″ is lifted by the distance “C” or more formed between the discharge valve 34 and the valve spring 35 ″, the valve spring 35 ″ is also lifted together with the discharge valve 34.

When the suction stroke is advanced after the compression stroke is completed, the discharge valve 34 is accurately moved by pushing the discharge valve while the valve spring 35 ″ raised in the discharge process returns to the original position. The valve fixture 3 is fixed to one side of the plate 40 ″ in this way.
A valve spring 3 in which the discharge valve 34 is securely fixed by 9 ", is firmly fixed to the other side, is inclined at a predetermined angle, and has a flat end 25" c on the free end 35 "a side.
The 5 "maintains a constant interval between the discharge valves 34, and the discharge valves 34 are smoothly opened and closed.

[0028]

As described above, in the hermetic compressor according to the present invention, the plate 40 in which the valve spring 35 and the retainer 36 are integrally formed is used as the head and the head cover 38.
The installation between them has the advantages of simplifying the structure, improving work productivity, and reducing manufacturing costs.

A valve device according to a modification of the present invention is
The discharge valve 34 is accurately fixed by the valve fixture 39 ″ provided on the plate 40 ″, and a predetermined distance is provided between the discharge valve 34 and the valve spring 35 ″ which is firmly fixed to the lower surface of the plate 40 ″. Is secured and the opening and closing of the discharge valve 34 is accurately controlled, so that overcompression loss due to the delay of the opening time of the discharge valve 34 or the high pressure gas inside the cylinder due to the delay of the closing time of the discharge valve 34 There is an effect that the backflow phenomenon is prevented and the performance of the compressor is improved, and since the shock generated when the discharge valve 34 is opened and closed is prevented by the valve spring 35 ″, vibration and noise are reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a valve device of a hermetic compressor according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the structure of the plate body of FIG.

FIG. 3 is a cross-sectional view showing a configuration of a modified example of the embodiment of the present invention.

FIG. 4 is a perspective view showing the structure of the plate body of FIG.

FIG. 5 is a cross-sectional view showing the configuration of another modification of the embodiment of the present invention.

FIG. 6 is an exploded perspective view showing a combined state of FIG.

FIG. 7 is a sectional view of a valve device of a hermetic electric compressor according to US Pat. No. 4,723,896 of the prior art.

FIG. 8 is an exploded perspective view of a valve device of a hermetic electric compressor according to the related art US Pat. No. 5,209,260.

FIG. 9 is a cross-sectional view of a valve device of a hermetic electric compressor according to US Pat. No. 5,328,338 of the related art.

[Explanation of reference numerals] 31 ... Cylinder head 32 ... Seating portion 33 ... Exhaust port 34 ... Exhaust valve 35, 35 ', 35 "... Valve spring 36 ... Retainer 39, 39', 39" ... Valve fixing tool 40, 40 ' , 40 "... Plate 50 ... Fixed protrusion

Continuation of the front page (72) Inventor Park Soon-Oh, South Korea, Kyun-Sangnam-Doh, Chang-Won, Keumyun-Don 391-2

Claims (6)

[Claims] 1. A valve installed in a groove formed in a head for opening and closing a discharge port, a valve spring elastically supporting the discharge valve, and a retainer for restricting a moving range of the discharge valve and the valve spring. A hermetic compressor comprising: a valve fixing member that fixes the discharge valve at a fixing portion, wherein the valve spring and the valve fixing member are integrally formed and installed between a head and a cover of the head. 2. The hermetic compressor according to claim 1, wherein the integrally formed valve spring and valve fixing member are attached to a plate body. 3. The hermetic compressor according to claim 1, wherein the valve spring and the valve fixing member which are integrally formed are inserted and fixed to a fixing protrusion formed on the head. 4. A discharge valve installed in a groove formed in the head to open and close a discharge port, a valve spring elastically supporting the discharge valve, and a retainer for restricting a moving range of the discharge valve and the valve spring. A hermetic compressor characterized in that the valve spring and the retainer are integrally formed and installed between the head and the head cover. 5. The hermetic compressor according to claim 4, wherein the valve spring and the retainer, which are integrally formed, are attached to a plate body. 6. The hermetic compressor according to claim 4, wherein a valve fixture is installed on the opposite side of the integrally formed valve spring and retainer.